Tomoko Sakurai

Tomoko Sakurai (さくらい ともこ) was originally just the female alter ego of Tomoki Sakurai, transformed with the help of Ikaros and her device to spy on the girls at school. However, she has since become an individual character separate from Tomoki altogether.

Appearance
Tomoko has dark black hair accompanied by two clips attached to the upper part of the strand of hair going down her face, one red and the other being blue. She has dark brown eyes as well.

Tomoko resembles Tomoki's mother Tomoyo Sakurai very much. Her measurements are: weight 43 Kg, height 157 cm (5'2),  hips 87 cm,  bust 75 cm, Waist 49 cm.

Abilities
Tomoko, when separated from Tomoki, does not have any remarkable abilities. However, it was shown that she gained the ability to merge with Tomoki at will upon becoming an individual. However, unless Tomoko is manipulated, she does not have even the slightest interest in merging with him.

When Tomoki transforms into Tomoko, he gains the looks, charm, and appearance of her. Due to having the appearance of a female, nearby women to drop their guard, thinking the they are safe among other women. This gives Tomoki much more freedom to move around without causing any suspicion, as well as the element of surprise. While disguised as Tomoko, Tomoki purposely acts clumsy and ditsy in order to win the hearts of the people (both male and female) around him such as "accidentally" tripping and landing face first into Sohara's breasts.

Separated From Tomoki
As an individual herself, when separated from Tomoki, Tomoko has been shown to be very feminine. This makes sense, as she is an actual girl once separated. She has also been shown to be a very timid and shy girl, which is a dark contrast to the ditsy carefree personality Tomoki uses when transformed into her. Her true personality was shown when she became an individual in chapter 43. When Tomoko was separated from Tomoki in that chapter of the manga, it was apparent that she was very confused and did not know where to go as she was just given freedom as a person. We could see her picking petals off of a flower after she had begun to develop feelings of love towards Sugata. Again, showing that she is in fact an individual separate from Tomoki. When Tomoki found her and told her to "merge" back with him, she seemed hesitant but agreed at first. However, upon seeing Sugata, she began to realize that she was enjoying her own life. Tomoki, desperate, decided to try to, "reawaken", her masculinity which the girl obviously did not have. When Tomoki began to tell her lies such as that she was really a man, was really not a girl, and needed to "merge" back with him, it only caused her more distress and confusion. Finally, after Tomoki's last resort of showing her a porno magazine in hopes that it would convince her to join with him, Tomoko was pushed over the edge and, with tears in her eyes, called him a cockroach after directly telling him that she never wanted to see him again.

Shortly after this had all taken place, we see Tomoko yet again, who has actually begun to make friends with the students at her new school. However, Ikaros, enraged because her master Tomoki is unable to pet her head, attempts to force Tomoko into merging with Tomoki. This frightens Tomoko and, desperate, tells Ikaros that in a way, she is her Master as well. Hearing this, Ikaros pauses, as she does not want to hurt her "Master." However, she trips, falling on top of Tomoko and shoving the latter's face directly into her breasts. Immediately, Tomoko begins to feel something very intense and unusual. This feeling was the perversion which was unfortunately left inside of her from Tomoki. Ikaros then realizes that she may have found a way to convince her to merge with Tomoki. Ikaros then fires Artemis to cut off the clothes of Tomoko's new friends. This apparently aroused her yet again. Shortly after these intense sensations began to grow stronger, Astraea is thrown at her. In Tomoko's confusion and feeling as if something was missing, Ikaros presented Tomoki to her. Tomoko, after having her mind manipulated by not only Tomoki, but Ikaros as well, decides to merge with Tomoki. However, as stated, her decision to merge was only due to her being manipulated. Tomoki's lies to her, Ikaros taking advantage of the perversion left in her from Tomoki, and the fact that she was helplessly confused during all of this, lead the girl to a state of mind in which she agreed to merge with Tomoki. However, before this happens, Tomoki stops her and claims that if they work together, they can touch twice the amount of breasts. Tomoko, with her mind having been manipulated, agrees. The two of them then begin chasing Tomoko's new friends. Sohara then attempts to stop Tomoki from touching the other girls and manipulating Tomoko's mind by giving him one of her karate chops. However, this creates a tiny clone of Tomoko and shrinks Tomoki even further. Sohara relentlessly attempts to karate chop him but it only makes matters worse. After this, Tomoko merged with Tomoki until at least the ending of the manga.

Due to the events that took place surrounding her in the manga, it is rather likely that Tomoko was separated from Tomoki forever a short time after the series ended. This can be assumed by taking into consideration that she isn't just a transformation anymore. She is now an actual person.

Relationships
Tomoki - Technically the "original" (Male)

Sugata - Love interest

Girls at school - Close friends

Mikako - Love rival

Trivia

 * Tomoko herself debuts in chapter 43.
 * Tomoki, when disguised as Tomoko, makes appearances in Chapters 16, 33, and 59.
 * Her Japanese voice actor is also the voice-bank of Hatsune Miku.
 * Tomoko has become an actual character in the series as opposed to just being a mere transformation used by Tomoki to do a variety of perverted acts. This was all shown in chapter 43 of the manga.
 * At the end of chapter 43 of the manga, Tomoko was tricked into merging with Tomoki due to her confusion concerning her aroused state. It is very likely that she became separated from Tomoki forever sometime after the series ended.
 * It is implied that due to her being an actual girl as well as a character as opposed to being a gender-bend of Tomoki, that she likely became a separate character altogether after the series ended.